| Marchant's zone | The area on the sphenoid and occipital bones at the base of the skull from which the dura mater is readily detached. (05 Mar 2000) |
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| marginal zone | The outer, nonnuclear layer of the embryonic neural tube; into its fibrous network grow the longitudinal nerve fibres which eventually become the white matter of the cord and brain stem. Synonym: marginal zone. (05 Mar 2000) |
| vermilion zone | The red margin of the upper and lower lip that commences at the exterior edge of the intraoral labial mucosa ("moist line") and extends outward, terminating at the extraoral labial cutaneous junction; a thinly keratinised type of stratified squamous epithelium deeply penetrated by well-vascularised dermal papillae which show through the translucent epidermis to impart the typical red appearance of the lips. Synonym: vermilion zone, vermilion transitional zone. (05 Mar 2000) |
| recruitment zone | <cell biology> Region of cytoplasm in the rear third of a moving amoeba where endoplasm is recruited from ectoplasm. (18 Nov 1997) |
| gingival zone | That portion of the oral mucosa which surrounds the teeth and is firmly attached to the underlying alveolar bone. (05 Mar 2000) |
| reflexogenic zone | The area or zone where stimulation will elicit a given reflex. (05 Mar 2000) |
| pectinate zone | The outer two-thirds of the basilar membrane of the cochlear duct. Synonym: zona pectinata. (05 Mar 2000) |
| pellucid zone | <cell biology, gynaecology> A translucent, elastic, noncellular layer surrounding the ovum of many mammals. (11 May 1997) |
| Golgi zone | <cell biology> Part of the cytoplasm occupied by the Golgi apparatus, in secretory cells of exocrine glands, a zone between the nucleus and the luminal surface. (05 Mar 2000) |
| cervical zone | The lower fourth of the pregnant uterus, attachment of the placenta to any part of which may cause dangerous haemorrhage. Synonym: cervical zone. (05 Mar 2000) |
| cervical zone of tooth | The slightly constricted part of a tooth, between the crown and the root. Synonym: cervix dentis, cervical margin of tooth, cervical zone of tooth, collum dentis, dental neck. (05 Mar 2000) |
| peritubular zone | The dentinal matrix surrounding the odontoblastic process; it is more highly calcified and contains finer collagen fibres than does the rest of the dentinal matrix. (05 Mar 2000) |
| grenz zone | In histopathology, a narrow layer beneath the epidermis that is not infiltrated or involved in the same way as are the lower layers of the dermis. Origin: Ger. Grenze, borderline, boundary (05 Mar 2000) |
| ciliary zone | The outer, wider zone of the anterior surface of the iris, separated from the pupillary zone by the collarette. Synonym: zona ciliaris. (05 Mar 2000) |
| Weil's basal zone | The layer beneath the odontoblasts of the tooth; it contains reticular fibres but few if any cells. Synonym: Weil's basal zone. (05 Mar 2000) |